Petrus "Piet" Johannes Fourie ((1842-06-20)20 June 1842 – 23 May 1916(1916-05-23) (aged 73))[1][7] was a Boer general for the Orange Free State in the Anglo-Boer War (1899–1902) in South Africa.

Fourie was the eldest son of Louis Jacobus Fourie (Uitenhage, Port Elizabeth, Eastern Cape, South Africa, 27 January 1814 – Vet River, Winburg, 28 June 1856) and Maria Magdalena (Magdalina) Pieterse(n) (3 September 1815 – Rustfontein, Bloemfontein, Free State, South Africa, 2 July 1868), among in total two daughters and two sons.

[1] He married Maria Magdalena van Tonder (Ladismith, Western Cape, 17 March 1850 – Dewetsdorp, Free State, 16 April 1940), and had four sons and one daughter by her.

[10] In February 1901 De Wet sent his generals Froneman and Fourie with many troops east of the Cape Town-Bloemfontein railway line to mislead the British.

De Wet and his smaller unit crossed the Orange River at Sand Drift, 60 kilometres west of the railway and marched into the Cape Colony.